Файл: Магистерская диссертация тема работы Зарезка бокового ствола как метод интенсификации добычи нефти на Лугинецком.pdf

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Коновалов А.А. “Анализ эффективности применения технологии бинарных смесей для разработки трудноизвлекаемых запасов на месторождениях Западной Сибири”, XXIII
Международный симпозиум студентов, аспирантов и молодых ученых имени академика М.А. Усова
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2.
Коновалов А.А., Дудин Е.Ю./ “Анализ эффективности применения технологии бинарных смесей для разработки трудноизвлекаемых запасов на месторождениях Западной Сибири”, VIII Международная молодежная научная конференция “Наукоемкие технологии в решении проблем нефтегазового комплекса”, 2018 г.
3.
Ахмадулин Р.Р., Коновалов А.А. / ” Анализ эффективности абсорбционной осушки газа различными абсорбентами. Расчет тарельчатого абсорбера” / Проблемы геологии и освоения недр: труды XXII
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64 18. Батурин А. Ю. Геолого-технологическое моделирование разработки нефтяных и газонефтяных месторождений. – М: Изд. ВНИИОЭНГ, 2008 – 111 с.
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65 32. Зарезка боковых стволов. Учебное пособие. ОАО «Самаранефтегаз»,
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33. Отчет по договору оказание услуг по выполнению программы экологического мониторинга и производственного аналитического контроля на месторождениях ОАО «Томскнефть» ВНК в 2010 г.
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40. Медведский Р.И., Севастьянов А.А.. Оценка извлекаемых запасов нефти и прогноз уровней добычи по промысловым данным. – С-Пб.: Недра, 2004.

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Приложение А
Раздел 1
Introduction
Literature review
Conclusion
Студент:
Группа
ФИО
Подпись
Дата
2БМ7Т
Коновалов Андрей Александрович
Консультант – лингвист отделения (НОЦ) школы ИШПР
Должность
ФИО
Ученая
степень,
звание
Подпись
Дата
Ст. преподаватель
Новикова В.С.

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Introduction
Luginetskoe oil and gas condensate field was discovered in 1996 by exploration well No. 152. The development of the field has been conducted since
1982 with the launch of exploration well No. 155, production drilling started in 1983.
At the moment, the development of the field is carried out according to the project document “Addition to the technological scheme of development of the Luginetskoe oil and gas condensate field (JSC Tomskneft VNK)” (Rosnedra Protocol No. 5680 of
17.10.2013). The accumulated oil production as of 01.01.2016 is 18223 thousand tons, the selection from the BOTTOM – 40.6%. Actual oil production in 2015 amounted to 424.0 thousand tons, which is lower than the design value by 48.7 thousand tons (10.3%). The presented data on the state of development of the
Luginetskoe oil and gas condensate field indicate an unsatisfactory state of development. In accordance with the above indicators, a design decision was made to withdraw wells from inactivity and extract residual oil reserves at the field. One of the most effective and common methods of reworking of residual reserves is the restoration of marginal and emergency wells by cutting side shafts into adjacent interlayers.
Sidetracking is the most optimal, from an economic and technological point of view, technology that allows to enter into the development of previously untreated interlayers and hard-to-recover hydrocarbon reserves that could not be involved in the development of other methods. Thus, with the help of this technology, it will be possible to increase oil production and the coefficient of oil extraction from the reservoirs.
The use of sidetracking is particularly relevant in this field, as there is a significant part of the inactive well stock for reasons of high water cut, increased gas factor or on the verge of profitability due to low flow rate. This technique allows you to avoid unnecessary costs for drilling, construction and development of wells, as well as to involve in the development of previously non-drained interlayers and hard- to-recover hydrocarbon reserves, the production of which was not previously possible.

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The purpose of this work is to assess the effectiveness of the use of sidetracking wells for the production of residual oil reserves from the marginal hard- to-reach areas in the Luginetskoe oil and gas condensate field.
To achieve this goal, the work identified the following tasks:
1.
Assessment of the current state of development of Luginetskoe oil and gas condensate field.
2.
Forecast of technological parameters of the well in production mode.
3.
Evaluation of the effectiveness of the use of sidetracking (BSA) for the development of uneconomic reserves of hydrocarbons.
The main provision put forward for protection is the assessment of predictive indicators of oil production from the marginal hard-to-reach zones of the Luginetskoe field through the operation of the ZBS.
1. Literature review
1.1 Analytical review of the applicability of the side-barrel cutting method
During the operation of oil and gas fields, well flow rate decreases or stops over time due to the development of hydrocarbon reserves, a high degree of water cut, a high gas factor, as well as the deterioration of reservoir properties of reservoir reservoirs. Currently, for these reasons, a large number of wells are idle on the territory of the Russian Federation. In this regard, the most effective method to restore the idle Fund and increase the productivity of marginal wells is cutting side wells. [1]
Various technologies of cutting of lateral trunks with horizontal and lateral endings received mass introduction on fields of the Western Siberia. [2]
In the context of horizontal wells, an additional wellbore drilled from the original vertical or horizontal wellbore is a lateral wellbore. A multi-barreled or multi-level well will have several deliberate lateral boreholes drilled to open several productive formations.
Side hole drilling is an important process that helps to extend or give new life to wells that have been abandoned for technical and economic reasons. In the process

69 of drilling a well, it is possible that its wellbore will not pass through all the productive zones located at different depths of the formation. This can happen intentionally or accidentally at different depths. When reinterpreting these wells, they can detect additional productive zones at different depths, which have significant oil and gas reserves.
Initially, production wells can be withdrawn from production for various reasons: accidents, crushing or failure of the production column, a complex fracture of underground equipment, drowning or even the inability to clean the perforation interval from mechanical impurities.
Operators can also drill a lateral wellbore from an existing wellbore to add a lateral well for wide-ranging impact on the reservoir. The larger the coverage area of the Deposit, the greater the amount of hydrocarbon extraction.
In all these cases, it is possible to produce a significant amount of hydrocarbons during the operation of wells with side wells.
The technology of the lateral wellbore through the "window" of the casing allows to restore the productivity of even those wells that can not be operated in other ways or their operation is economically unprofitable.
One of the main conditions for effective drilling of lateral wells is the correct choice of wells. The following should be taken into account when choosing wells for drilling side shafts:
1) the expected production rate of the well should provide the required selection of hydrocarbons for a certain period of time;
2) information on the productivity of the planned side opening must match the information of industrial oil reserves;
3) it is desirable to select wells that open more than one productive formation or with productive formations that can be opened in the future to ensure long-term operation of the well.
In Russia, the majority of oil and gas fields are depleted (they are at the 3rd or
4th stage of development).

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This technology allows to drill new wells in old wells at reinterpretation of these fields.
From an economic point of view, the cost of sidetracking is about one-third or even half of the cost of drilling a new well.
The drilling of the lateral wellbore from the existing well allows to continue using its ground equipment and means for further oil and gas production. If you carefully study this technology, it is possible to extract up to 50 % of the initial oil reserves.
Demand for side barrels in Russia is increasing, as is the cost and complexity of drilling. Previously, it was only necessary to re-drill an existing well or drill a new hole to a new productive zone. Currently, the goal is to drill a new barrel with a horizontal end. The horizontal end is often used for multistage hydraulic fracturing and gives a large coverage of the reservoir.
The cost of drilling side wells compared to drilling a new well is significantly low.
The process is environmentally friendly, environmental pollution in the process of drilling a side hole is less than when drilling a new well.
Despite the numerous advantages associated with the operation of wells with side wells, there are a number of complex problems in the process of drilling.

One of the main problems is the risk of discrepancies that arise between the actual well data and the lateral wellbore design, including the physical condition of the casing string, the presence of ring equipment, or discrepancies in relation to the trajectory. It is very important to carry out detailed preparatory work before drilling the side shafts – to build a modified barrel profile using a gyroscopic inclinometer and to ensure quality control of the technical condition of the production column.
After that, there are serious dangers during the drilling of the trunk. They can occur due to low downhole pressure and even technical problems in the form of drilling within a limited diameter. These problems limit the use of most technical devices to ensure safety during drilling.

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For successful and safe drilling of the side shaft it is important to take into account safety measures. The technical condition of the well must be assessed; the drilling programme must be approved.
Another serious problem arises in the form of pulsation of low and normal pressures. These pulsations lead to loss of circulation, and in some cases – to manifestations of reservoir fluids in the well during its drilling.
These complications can be minimized by selecting the right drilling fluids to isolate hazardous areas and by adjusting the drilling fluid density.
It is difficult to trust the reliability of old equipment in old wells in the process of drilling side shafts. There are many risks associated with the condition of the columns, especially in the intermediate columns, through which the side barrel
Windows will be cut. A detailed pre-design of the barrel is required to minimize the risks.
The complex design of the profiles of the side barrels is a serious problem.
Perhaps not all oil companies have the necessary technology and experience. In some cases, drillers require corrective measures to address problems arising from the first drilling attempt. This affects the cost and viability of the well.
The momentum of lateral shafts in the modern oil and gas industry is felt everywhere. Despite the high cost of drilling a side hole, its numerous risks, it is very economical compared to drilling a completely new well. With lateral wellbore technology there is life for almost all wells that have been stopped due to wellbore blocking equipment, drowning or complications. Potential oil and gas reservoirs that were not originally opened can be opened by drilling side shafts. [3]
Speaking about the advantages of cutting side barrels with a horizontal end
(ZBGS), we can highlight the following fundamental points:
1) there is No need for land alienation;
2) there are significant economies of materials and tools;
3) there Is a possibility of use of mobile drilling rigs of smaller loading capacity;

72 4) the Cost of construction of BGS reaches only 50-70 % of the cost of a new well;
5) increasing production rates by increasing the length of a trunk of up to 50-
100 m.
When making a decision to cut BGS from a specific vertical well, the following criteria should be followed:
1) reservoir Capacity should be at least 3 m for BGS input;
2) the azimuth of drilling BGS is directed towards the occurrence of the maximum recoverable reserves;
3) the Values of the current pressure should provide an effective process of displacement of oil, otherwise it is necessary to maintain reservoir pressure by flooding;
4) the Ability to transfer the wellbore under the injection of the displacing agent;
5) in Order to recoup the costs of construction under the ZBGS, the residual reserves should be comparable to those recovered.
All other things being equal, preference is given to those wells that have already crossed unprocessed reserves. [3].
Okonchanii sidetracking and their commissioning is necessary to monitor the work of these BS. In the initial period of operation (within six months), it is necessary to conduct monthly hydrodynamic studies of wells at the steady-state and non- stationary modes of fluid flow in order to determine the hydrodynamic parameters of the reservoir (productivity, hydroconductivity) and assess the state of the bottom-hole formation zone (skin effect, op parameter – ratio of productivity). According to the results of these studies, the influence of technological parameters of the ZBS on the production capabilities of the operational facility is determined and the correction of the applied technology of opening the productive layers by cutting the BS and BGS is carried out. [4]